Higher harmonic anisotropic flow of identified particles in Pb-Pb collisions with the ALICE detector

Anisotropic flow plays a crucial role in establishing the equation of state of the Quark Gluon Plasma. The results at RHIC and LHC have demonstrated that the matter created in heavy-ion collisions behaves as a nearly perfect fluid reflected in the low value of the shear viscosity over entropy density ratio (η/s). The higher flow harmonics are particularly sensitive to the value of η/s in hydrodynamic calculations. In this analysis, we present the first ALICE results on the pT differential v2, v3 and v4 for π±,K±,p(p‾) from the high statistics 2011 heavy-ion run. We investigate how these vn coefficients evolve with particle mass and centrality for the 0-1% and 20-30% centrality ranges. These new measurements aim at differentiating between models that use different initial conditions, constraining further the value of η/s and allowing to decouple the influence of the late hadronic stage from the hydrodynamic evolution of the system.